Reference for Moed Katan 7:4

וכיון דהלכתא למשרי ילדה לאו ממילא זקינה אסירה

But since 'halachah [-usage] allowed [tillage down to New Year] for saplings,it is not obvious that old trees were forbidden? - What we must say therefore is, the halachah [-usage] as basis for the prohibition is [necessary] according to R'Ishmael,<span class="x" onmousemove="('comment',' Who, unlike R. Akiba, uses that text for another point, namely, as permitting reaping the barley for the 'omer even on a Sabbath, if that is the date.');">⁷</span> whereas the texts [serve as basis] according to R'Akiba.

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